export const dynamic = 'force-dynamic'

import { NextRequest, NextResponse } from 'next/server'
import { createClient } from '@/lib/supabase/server'
import { getSession } from '@/lib/auth/get-session'

const ALLOWED_KEYS = [
  'DEEPSEEK_API_KEY',
  'GOOGLE_AI_API_KEY',
  'META_WHATSAPP_PHONE_NUMBER_ID',
  'META_WHATSAPP_ACCESS_TOKEN',
] as const
type SettingKey = typeof ALLOWED_KEYS[number]

export async function GET() {
  const session = await getSession()
  if (!session || session.role !== 'admin') return NextResponse.json({ error: 'Forbidden' }, { status: 403 })

  const supabase = await createClient()

  const { data } = await supabase.from('app_settings').select('key, value, updated_at')
  const masked = (data ?? []).map(row => ({
    key: row.key,
    set: Boolean(row.value),
    masked_value: row.value ? `${row.value.slice(0, 8)}${'•'.repeat(12)}` : '',
    updated_at: row.updated_at,
  }))
  return NextResponse.json(masked)
}

export async function POST(request: NextRequest) {
  const session = await getSession()
  if (!session || session.role !== 'admin') return NextResponse.json({ error: 'Forbidden' }, { status: 403 })

  const supabase = await createClient()

  let body: { key?: string; value?: string }
  try { body = await request.json() } catch {
    return NextResponse.json({ error: 'Invalid JSON' }, { status: 400 })
  }

  if (!body.key || !ALLOWED_KEYS.includes(body.key as SettingKey)) {
    return NextResponse.json({ error: 'Invalid key' }, { status: 422 })
  }
  if (typeof body.value !== 'string' || body.value.trim() === '') {
    return NextResponse.json({ error: 'value must be a non-empty string' }, { status: 422 })
  }

  const { error } = await supabase.from('app_settings').upsert({
    key: body.key,
    value: body.value,
    updated_at: new Date().toISOString(),
    updated_by: session.sub,
  })
  if (error) return NextResponse.json({ error: 'Save failed' }, { status: 500 })

  await supabase.rpc('write_audit_log', {
    p_table_name: 'app_settings',
    p_record_id: session.sub,
    p_action: 'UPDATE',
    p_new_value: { key: body.key, set: Boolean(body.value) } as never,
  })

  return NextResponse.json({ ok: true })
}